Just so you know, the first two days are all singles (maybe day 3 too, I can't remember), so if you want to see doubles, get tickets for Day 4 onwards. If you get tickets for two days in a row, then you will pretty much cover the upper and lower brackets of the draw. Ticket for the Day session also allows you to stay and see most of the night matches (at the outside courts, Grand Stand and Amstrong).
Stay in Manhattan (especially if your husband is not a tennis fan, he can go wander off as you spend >10 hrs each day at the USTA
). It's about 40 min from Time Square to the USTA by subway. Safety should not be a concern as there are plenty of people riding the #7 train at all times.
I am sure you will have a great time.